John Deere 467

Baled the first 35 rolls today with my new to me 467. Baled real good but sometimes my volt meter on tractor would climb to the orange and when it did it the monitor would beep and flash battery and show 15.5 16.5 volts. Then when volt meter went back to green it would bale fine. I’m baling with a 4230 with monitor wired directly to the battery. Has anyone experienced these issues?

John Deere 467